I love love love ginger dressing (the kind you get at Japanese restaurants) more than life itself. I keep 2 bottles in my fridge at all times b/c I try to eat a salad every night.
Also, for all you Floridian TCS-ers...there is a great Spanish restaurant called the The Columbia (it has locations in Tampa, St. Augustine, Clearwater, Sarasota, and West Palm) and their 1905 salad is absolutely to-die-for! <--- Yes, it's THAT good! AND you can buy it online
I usually ONLY eat italian, but if I had to pick something else it would be ranch. As far as italian goes, nothing beats the house usually, but at home I currently (and for about the last 5 yrs) have had an obsession with Marzetti's Italian.